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AC blows a fuse when switching to heater and vice versa

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Look in your owners manual and make sure the fuse is of the right rating

Posted on Sep 10, 2008

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Fuse keeps blowing on a/c on 2001 dodge truck


Let's break this down.
1 Does the fuse blow when the heater is on, or just the AC?
Yes- Fan motor problem likely need new blower motor.
No- 2
2 Disconnect the AC compressor clutch wire. Remove the blown AC fuse, connect a multimeter across the sockets for the fuse, measure DC voltage across the two sockets with the AC switch, and Ignition switch ON. Is Battery voltage present?
Yes- The wiring harness has a short between the output of the AC switch and ground, likely a pinched harness.
No- The AC compressor clutch is shorted. Replace either the whole compressor or the clutch.

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Nissan versa 2007 the fan and ac light stop?


No power passing through the switch to activate the fanin the heater box. First point is to check for a blown fuse. Next point is to see if the motor resistor are not burnt out

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1 Answer

1992 323 mazda want blow heat out


REPLACE THERMOSTAT.IF ALREADY DONE.CHECK HEATER BLOWER MOTOR SEE IF POWER GOING TO HEATER BLOWER MOTOR.IF YES BLOWER MOTOR BAD.IF NO POWER GOING TO BLOWER MOTOR CHECK AC AND HEATER CONTROL FUSE AND CHECK BLOWER MOTOR FUSE AND RELAY IF ALL IS GOOD CHECK SEE IF POWER GOING TO AC AND HEATER CONTROL SWITCH IF YES THE AC AND HEATER CONTROL SWITCH COULD BE BAD.

Nov 10, 2011 | 1991 Mazda 323

1 Answer

2004 Nissan Titan-When I change my Heater to A/C or vice versa I


There is an actuator that moves the diverter that makes the noise.

See this thread for a how-to fix.

http://www.titantalk.com/forums/titan-problems-dealer-service/105851-how-fix-annoying-clicking-heater-ac-actuator-under-dash-w-pics.html

As for the beeping noise, could be the tire pressure sensor. When it beeps, look for a yellow warning light that looks like this ( ! ) Means you have a tire that is low on air.

Apr 12, 2010 | 2004 Nissan Titan

1 Answer

There is no heat blowing ou of the vens on my van


The water must be able to circulate and there are three main things to stop this from happening.Heater core blockage,thermostat and water pump.
After checking those you must look at the controls under the dash to see if a dampener door is remaining closed.The doors will shut off the heater core from air circulation when using the air conditioning and vice versa. After starting the van switch the controls for temperature from cold to hot and listen for the door to open and close.That's where I would start.Also you have a Heater Control Valve that shuts off all hot water from entering your heater core.If this valve is closed you would get no to very little heat.It's located in the heater hose from the intake to your heater core.

Dec 30, 2009 | 1993 Ford Econoline

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My 1997 jaguar xj6 blows air but no heat. Can anyone help? I checked all fuses, and AC works.


the only thing that can change the air from hot to cold, or vice versa is the blender door. under your dash is a box which has 2 compartments. one with your heater core which is hot and one with ac which is cold. the blender door basically diverts which on the air in your car is being drawn from. if it is cold, air is moving on the ac side. if its hot, air is moving through the heater core side. if its warm, the door is in the middle. your temperature control knob is conecteted to an actuator, which moves that door. the actuator is a motor, but if it goes out, the door will be stuck on whichever side it is on. i would check that first. hope this helps

Oct 20, 2009 | 2001 Jaguar XJ8

1 Answer

1998 Isuzu Rodeo is having issues.


check to see if AC and HEATER blower motor is getting power .if yes replace blower motor.if no you have problems in relay- fuse- or ac and heater switch is bad.for sun roof check for power at switch if yes sun roof eletric motor need replace.or sun roof in a bind.if no power to sun roof switch.blowed fuses and bulbs or turn signal switch is bad.

Jun 21, 2009 | 1998 Isuzu Rodeo

1 Answer

2004 dodge stratus heater/ac issues


I had the same problem with my '97 Stratus. There is a large resistor in the fan motor circuit that has died and needs to be replaced. It's well up under the dash, behind the glove box if I recall correctly, so unless you are a contortionist and have the tools, have a shop replace it.

Nov 04, 2008 | 2004 Dodge Stratus

1 Answer

Heater or ac fan does not blow, ac still cold, fuse where is it


Yes, but more likely the fan speed switch is defective or the blower is defective

Oct 20, 2008 | 2005 Chevrolet Suburban

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